Monkey wrench



April 3, 1928.

F. JURICINEC MONKEY WRENCH Filed Sept. 27. 1926 2 Sheets-Sheet 2 fnvevnfor F fez rz'cz'na iii 3.

Patented Apr. 3, 1928.

FRANCOIS JURICINEC, F EARIS, FRANCE.

MONKEY WRENCH.

Application filed September 27, 1926, Serial No. 138,047, and. in France Qotoher 8, 1925.

My invention relates to monkey wrenches of the type which, when actuated in view of rotating the part to be screwed down or to be unscrewed such as a bolt, a nut, a tube a and the .like provide automatically for the tightening of the jaws whereby the bolt, nut, tu e, or other similar part is securely held and can be released subsequently only by means of a special movement adapted to proto vide this release.

My improved monkey wrench comprises primarily a lever to the end of which is secured a spindle bearing a pinion meshing with a rack borne by the body of one ofthe 18 jaws or preferably with two racks borne respectively by the bodies of the two jaws; In the latter case the two racks are disposed so as to move in opposite directions when the pinion rotates. This arrangement provides a greater relative displacement of the two jaws" for a given rotation of the pinion whereby a given wrench can be used for a wider range of diameters of the parts to be tightened.

Moreover the bodies or stems of the two jaws are enclosed in a substantially parallelepipedic casing inside which they can slide with a slight friction whereby'no play can.

arise either longitudinally or transversely.

A. form of execution of my invention is described hereinbelo'w by we. of example and illustrated whereof a v Fig. 1 a side view of the wrench when not working. j a r Fi 2 is a partly sectional side view, the jaws eing shown removed apart before closmg over a nut or the like. i

Fig. 3 is a partly sectional front viewiof the same wrench.

- Figs. 4 and 5 are side views of slightly modified wrenches. r

The wrench shown on Figs. 1 to 3 comprises a spindle 2 to which is keyed the pinion? A parallelepipedic casing 4 is pivotally secured to the same spindle and is suitably cut open at its top end 5. This casing contains the two stems 6 and 7 forming respectively so the lower and upper jaws 8 and 9 which prostems .6 and 7 are respectively provided with on appen ed drawmgs' I 'ficient for this, to push the rod 14 m the 85 proper direction.

the racks 10 and 11, both of which mesh with the pinion 3 at diametrically opposite points thereof.

The wrench works as follows. When a part is to be taken hold of, the lever 1 is rotated in the direction of the arrow 12 where by the jaws 8 and 9 are removed away from each other until they are sufiiciently spaced to allow the said part'to be taken hold of. For tightening the latter, the lever is rotated in the op osite direction, that of the arrow 13; thus t e part is tightened, whilst thetwo jaws are brought closer and press more 05 tightly against the part to be tightened by the rotation of the lever 1.

For unscrewing or releasing a part the -Wrench is turned back to frontso that the side shown as the upper side on Figs. 1 and 2 becomes the lower side. Then the part to be unscrewed being secured between the jaws 8 and 9, the lever 1 is rotated in the direction. which causes the jaws to move towards each other. The stems 6 and 7 being enclosed inthe casing 4 cannot show any pla in the plane either of Figs. 1 and 2 or-of ig. 3.

In the modified wrench shown on Fig.4, the stem 6 extends beyond and below the cas- 30 ing 4 and forms the rod 14 whereby an-easier handling is provided. This arrangement does away with the necessity of turning the tool back to front for unscrewing. It is suf- The modified form shown on Fig. 5Iis specially adapted for tubes. The jaws 8 and 9 .are oblique with reference to the stems 6 and 7 .and the uncurved inner side 15 at the jaws .9 is toothed or striated.

What I claim is: v

,1. In a monkey wrench comprising a casing, twojaws shding in said casing, a com- 'mon pinion between said jaws, a rack home a controllmg lever 1 hearing at its inn'erend by each jaw and meshing with the common P1111011, the combination of a. forked control lever, the inner ends of. which pass on either side of the casing and a spindle to which the common pinion s keyed passing through the casing and fixed to the and inner ends of the control lever. ject beyond the top 5 of the casing 4. The

2. In a monkey wrench comprising a 00.5; mg, two jaws shding in said casing, a common pinion between said jaws, a rack borne control lever, and an extension of one of the by each 'aw and meshing with the common jaws substantially 'parallel to the control inion t e combination of a forked control lever.

ever the inner ends of which pass on either i In testimony whereof I have signed my 5 side of the casing, a spindle to which the name to this specification.

common pinion is keyed assing. through the I casing and fixed to the sand inner ends of the FRANCOIS JURICINEC. 

